Furnace of steam-boilers



UNITE STATES BATEN FFOE.

EDWARD H.. JONES, OF ALBANY, AND R. STEVENSON,

OF SGHENECTADY, NEW YORK.

FURNACE OF STEAM-BOILERS.

Specification of Letters Patent No.V 25,901',- dated- October 25, 1859*.

description thereof, reference being had to the annexed drawings, makinga part of this specification, in which- Figure l is a Vertical sectionof the inside fire box, showing the grate frame in half-section; andFig..2, a plan view.

Our invention relates to placing the fire rates of the boiler at thebottom of an adjustable, hopper-shaped box; thereby reducing the gratesurface, and at the same time retaining the great amount of mosteffective heating surface obtained by the use of a large furnace; thisbox is so arranged that it may be raised or lowered as the contingencyof a light or heavy fire may require. The reduced area of great surfacetends to increase the intensity of the draft, produces a more perfectcombustion, and prevents the admission of a surplus supply ofatmospheric air more than is necessary to maintain the fire, therebypreventing the loss of effect of the fuel by the cooling of the heatingsurfaces of the boiler. The inclined sides of the box serve toconcentrate the fuel during the process of consumption, and deflects theflame against the sides and crown-sheet of the furnace, its action beingvery similar in effect to the action of the flame in a reverberatoryfurnace.

llhe following description will enable others skilled in the art to makeand use our invention.

A, is the inside re box of the boiler. The hopper-shaped box is made ofthe two frames B, B, connected together at any required distance bymeans of the stays C, C, O, etc.; the side plates D, D, D, D, are madeto fill up the spaces left between the frames B, B', and may be madewith spiculated surfaces for the purpose of retaining fire-clay or anyother non-conducting material to prevent the loss of heat fromradiation. The rocking grates E, E, are hung upon journals e, e, and areheld to their place by boxes as shown at e; attached to each grate is anarm F, F; connected together by the rod f, and to the hand-lever G, bythe rod g. The hopper-shaped box rests upon four cams H, H, etc.:simultaneous motion is given to these cams by means of the hand-lever J,which, by the rod j, is connected to the arm I, of the tumbling shaft h,to which are fastened two of the cams, they being connected to the othertwo by the rods h, L. The hanger K, serving as fulcrums for thehand-levers G, and J, is attached to the foot board L.

The arrangement herein shown has special reference to its use inlocomotive engines; when used for stationary or marine purposes thehand-levers Gr and J, may be attached to the boiler or to any convenientpoint contiguous thereto.

The fuel, when too closely packed, or choked by an accumulation ofashes, is agitated by rocking the grates bygiving a slightmotion to thehand-lever G; and

when required the lire may be entirely dumped by the same means bygiving more motion to the lever.

The box may be held to any required elevation by moving the cams by thelever J,

and securing it.

The grates may be rocked or agitated by means of the level' Gand itsconnections without disturbing the position of the grate frame or box;and the grate frame or box may be elevated or depressed while the gratesmay be retained in a horizontal or other position; or the grate frame orbox may be elevated or depressed at the same time that the grates arerocked or agitated,

to insure a more speedy clearance of the grates if desired.

XVe do not confine ourselves to the particular arrangement herein shownto raise and lower the hopper-shaped box, as the same may be effectedwith equal facility by means of connected screws, racks and pinions, andother well known devices.

Among the advantages that we claim for our improvement, is its economyof fuel by reason of the more perfect combustion obtained, and byregulating the height of the fire to the work required; its simplicity,and its non-liability to derangement,

What We claim as our invention and deother and to the boiler re box A inthe sire to secure by Letters Patent, is manner, and for the purposesset forth. The arrangement of the'hopper-shaped EDWARD H. JONES. gratebox B, D, so constructed as to be ad- ROBERT STEVENSON. 5 justable inheight, combined With the grates Vitnesses:

E, E, having means attached for rocking JAS. E. NOBLE, or agitatingthem, in their relation to each WM. H. LOW.

